For the ACD is shown below, select all the true statements. Lengths are rounded to the nearest tenth

ABD = 180 - 65 = 115 degrees

ADB = 180 - 45 - 115 = 20 degrees

First box, no check.

ACD is 90 degrees, so

second box, no check

Law of Sines:

AB / sin ADB = AD / sin ABD

AD = AB (sin ABD / sin ADB ) = 18 (sin 115 / sin 20) = 47.6976

ACD is an isosceles right triangle so

CD = 47.6976/√2 = 33.7

CD=33.7, CHECK

sin 65 = CD/BD

BD = CD/sin 65 = 33.7/sin 65 = 37.2

BD=37.2 CHECK

solution:

→c= a b , that is product of a and b is possible only when when a is m × n matrix and b is n × p matrix.

that is, number of columns of a= number of rows of b.

so, size of matrix , c= a b is , if a = (m × n)matrix

b= (n × p)matrix

then a b = [ (m × n)matrix] ×[   (n × p)matrix ]

→→c= a b= [m × p ] matrix

→→size of product a b will be equal to = number of rows of a × number of columns of b